Centos7搭建LVS負載均衡

主機：192.168.111.51

備機：192.168.111.52

lvs vip: 192.168.111.50

yum -y install gcc gcc-c++ make popt popt-devel libnl libnl-devel popt-static openssl-devel kernel-devel

ln -s /usr/src/kernels/3.10.0-514.el7.x86_64 /usr/src/linux

yum -y install ipvsadm ipvsadm -v ipvsadm v1. 272008/5 /15(compiled with popt and ipvs v1.

2.1)

yum install keepalived
keepalived -v<
keepalived v1.
2.13(05
/25,2017
)

以下是在安裝keepalived時的依賴關係：

installed:

keepalived.x86_64 0:1.2.13-9.el7_3

dependency installed:

lm_sensors-libs.x86_64 0:3.4.0-4.20160601gitf9185e5.el7 net-snmp-agent-libs.x86_64 1:5.7.2-24.el7_3.2 net-snmp-libs.x86_64 1:5.7.2-24.el7_3.2

修改iptables配置，在主機上放開備機進來的流量，在備機也做相似設定：

firewall-cmd --direct --permanent --add-rule ipv4 filter input0-- in-inte***ce enp0s3 --destination 224.0 .0.18 --protocol vrrp -j accept

firewall-cmd --reload

注：在備機上，該配置檔案僅有router_id和priority的值不同。其它值均一致。

以下為主機上的配置舉例：

global_defs 
notification_email_from [email protected]
smtp_server 127.0
.0.1
smtp_connect_timeout 30
router_id lvs_51
}vrrp_instance vi_1
virtual_ipaddress 
}virtual_server 192.168
.111
.508888
}     real_server 192.168
.111
.628888}}
virtual_server 192.168
.111
.508000
}     real_server 192.168
.111
.628000
}}

啟動keepalived服務

# systemctl start keepalived

檢視keepalived服務狀態

# systemctl status keepalived

設定為隨系統自啟動

# systemctl enable keepalived

檢視系統網絡卡vip是否已經生效

# ip a

抓包觀察是否有主機定時發出的vrrp包

# tcpdump -p vrrp -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on enp0s3, link-type en10mb (ethernet) , capture size 65535 bytes10: 16:13.375399 ip192.168 .111 .51> 224.0 .0.18 : vrrpv2, advertisement, vrid 50 , prio 100 , authtype ******, intvl 1s, length 2010: 16:14.376542 ip192.168 .111 .51> 224.0 .0.18 : vrrpv2, advertisement, vrid 50 , prio 100 , authtype ******, intvl 1s, length 2010: 16:15.377596 ip192.168 .111 .51> 224.0 .0.18 : vrrpv2, advertisement, vrid 50 , prio 100 , authtype ******, intvl 1s, length 2010: 16:16.378590 ip192.168 .111 .51> 224.0 .0.18 : vrrpv2, advertisement, vrid 50 , prio 100

, authtype ******, intvl 1s, length 20

對keepalived的主備切換、vip位址漂移進行測試。

# systemctl stop keepalived

# systemctl start keepalived

注：為減少服務自動搶占對業務的影響，lvs服務是配置為執行在非搶占模式下。

chmod 700 /usr/local/src/lvs_real_server.sh echo "/usr/local/src/lvs_real_server.sh start" >> /etc/rc.d/rc.local

/usr/local/src/lvs_real_server.sh start

以下為lvs_real_server.sh的內容，注意要更新vip參配置：

vi  lvs_real_server.sh
#!/bin/bash
vip=
192.168
.111
.50.
/etc/rc.d/init.d/functions
case
"$1"
instart)
ifconfig lo:
0 $vip netmask 255.255
.255
.255 broadcast $vip
route add -host $vip dev lo:
0        echo "1"
>
/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2"
>
/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1"
>
/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2"
>
/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >
/dev/
null
2>&1
echo "real server start ok";;
stop)
ifconfig lo:
0 down
route del $vip
>
/dev/
null
2>&1
echo "0"
>
/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0"
>
/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0"
>
/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0"
>
/proc/sys/net/ipv4/conf/all/arp_announce
echo "real server stoped";;
*)echo "usage: $0 "
exit 1
esac
exit 0

在完成lvs部署後，後端提供服務的應用可能還沒有上線。這時需要預先測試lvs的負載均衡功能是否正常。方法是使用以下命令，在每個後端節點上臨時啟動乙個http server，服務埠設定為與lvs負載均衡服務相對應的埠號即可。使用後，停掉該命令即可。

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